/** Validate BSN according to http://nl.wikipedia.org/wiki/Burgerservicenummer */

verifyBsn.scala

private def isValidBSN(candidate: Int): Boolean = {
    var bsn = candidate
    if (bsn <= 9999999 || bsn > 999999999) {
      return false;
    }
    var sum: Int = -1 * bsn % 10;

    for (multiplier <- 2 to 1000 ; if bsn > 0) {
      bsn = bsn / 10
      var value = bsn % 10
      sum = sum +  (multiplier * value)
    }

    return sum != 0 && sum % 11 == 0;
  }